Ftw.table

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- Fix a Products.ATContentTypes bug in icon helper.
[mathias.leimgruber]

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- Fix bug which caused custom templates to be stored permanently.
[jone]

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- Fix regression from better "sortable" support (1.12), which
resulted in AttributeErrors when having the table template
customized.

Use `view.sortable_class(th)` instead of `view.sortable_class(th['sort_index'])`
in custom table templates.

[jone]

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- Support setting "sortable" to false for a column in non-ExtJS mode.
[jone]

- HTML style: support "width" of column definition as <col> width.
[jone]

- ExtJS style: fix improper layout.
Also show dummy column in table body using the same width used in the header.
[Julian Infanger]

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- Do not hide dummy column in extJs tables, its used for easy resize.
[Julian Infanger]

- Fix unicode decode error in helper
[elio.schmutz]

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- Implement "callable" values - implemented in get_value method of TableGenerator.
[mathias.leimgruber]